exam Maths Puzzle Numerical Ability

What is the formula that I would use to solve this problem. What are all the possible combinations for an answer queue if you have 25 true/false questions? Thanks for all your help

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exam Other Question

A 25% SOLUTION OF ALCOHOL IS TO BE MIXED WITH A 40% SOLUTION TO GET 50l OF A FINAL MIXTURE THAT IS 30% alcohol. How much of each of the original solution should be used? directions: find m angle S, given triangle RST~triangle XYZ, m angle R=89 degress, and m angle Z=42 degress. my answer to m angle S=49 degress. am i correct?